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XM29 OICW Major Components

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The XM29 OICW (Objective Individual Combat Weapon) was a series of prototypes of a new type of assault rifle that fired 20 mm HE airbursting projectiles. The prototypes were developed as part of the Objective Individual Combat Weapon program in the 1990s. The term SABR (Selectable Assault Battle Rifle) was also used at certain points, but is less common.

Developed by Alliant Techsystems, with Heckler & Koch as a major subcontractor, the most commonly seen version of the XM29 consisted of a semi-automatic 20x28 mm smart grenade launcher, an underslung assault carbine (derived from the HK G36 then in its late developmental stage) firing a standard 5.56x45mm NATO round, and a top-mounted computer-assisted sighting system with integrated laser rangefinder, thermal vision night vision capabilities, and up to 6x optical telescopic sight. Earlier designs used different configurations and setups.
The launcher part has been described variously as a light semi-automatic 20 mm cannon, a grenade launcher, or an airburst weapon. It poses a classification problem, in that it does not fit neatly into any one category. On one hand, it uses much smaller shells and has a much flatter trajectory than grenade launchers. On the other, while its caliber and velocity is more similar to light cannon, it does share traits with other infantry grenade launchers.
Various problems have effectively ended the program as it was originally envisioned, including weight, bulk, and lack of effectiveness of the 20x28 mm airburst round. Upon cancellation in 2004, it was split into three related programs. OICW Increment One is a program to develop a family of light kinetic energy weapons, OICW Increment Two is a program to develop the airburst grenade launcher as a standalone component, and OICW Increment Three will be a program to re-integrate the two components. The XM8 was developed in an attempt to meet Increment One requirements. Instead a new program known as Lightweight Small Arms Technologies (LSAT) was begun. Meanwhile, the XM25 25x39 mm airburst launcher began development to meet the Increment Two requirements. Increment Three will not be initiated until after One and Two are completed.
The OICW Increment I Request for Proposals was cancelled in October 2005, while development of the 25x40 mm XM25 continued, and the 25x59 mm OCSW program as well until its termination. It is not clear if LSAT is intended to meet the goals of OICW Increment I or if it is a stand-alone weapon system. However, for all intents and purposes, the OICW program is dead.

Assault rifle (Objective Individual Combat Weapon)

Heckler & Koch, Alliant Techsystems

KE Module - 5.56x45mm NATO HE Module - 20x85 mm

5.5 kg empty and 6.8 kg loaded (Objective), 8.2 kg loaded (actual)

890 mm

KE Module - 250 mm HE Module - 460 mm

Feed system:
KE Module - Various STANAG Magazines HE Module - 5 round box magazine

Rate of fire:
800 rounds/min


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